1 /* SCTP kernel implementation 2 * (C) Copyright IBM Corp. 2001, 2004 3 * Copyright (c) 1999-2000 Cisco, Inc. 4 * Copyright (c) 1999-2001 Motorola, Inc. 5 * Copyright (c) 2001-2003 Intel Corp. 6 * 7 * This file is part of the SCTP kernel implementation 8 * 9 * The base lksctp header. 10 * 11 * This SCTP implementation is free software; 12 * you can redistribute it and/or modify it under the terms of 13 * the GNU General Public License as published by 14 * the Free Software Foundation; either version 2, or (at your option) 15 * any later version. 16 * 17 * This SCTP implementation is distributed in the hope that it 18 * will be useful, but WITHOUT ANY WARRANTY; without even the implied 19 * ************************ 20 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 21 * See the GNU General Public License for more details. 22 * 23 * You should have received a copy of the GNU General Public License 24 * along with GNU CC; see the file COPYING. If not, see 25 * <http://www.gnu.org/licenses/>. 26 * 27 * Please send any bug reports or fixes you make to the 28 * email address(es): 29 * lksctp developers <linux-sctp@vger.kernel.org> 30 * 31 * Written or modified by: 32 * La Monte H.P. Yarroll <piggy@acm.org> 33 * Xingang Guo <xingang.guo@intel.com> 34 * Jon Grimm <jgrimm@us.ibm.com> 35 * Daisy Chang <daisyc@us.ibm.com> 36 * Sridhar Samudrala <sri@us.ibm.com> 37 * Ardelle Fan <ardelle.fan@intel.com> 38 * Ryan Layer <rmlayer@us.ibm.com> 39 * Kevin Gao <kevin.gao@intel.com> 40 */ 41 42 #ifndef __net_sctp_h__ 43 #define __net_sctp_h__ 44 45 /* Header Strategy. 46 * Start getting some control over the header file depencies: 47 * includes 48 * constants 49 * structs 50 * prototypes 51 * macros, externs, and inlines 52 * 53 * Move test_frame specific items out of the kernel headers 54 * and into the test frame headers. This is not perfect in any sense 55 * and will continue to evolve. 56 */ 57 58 #include <linux/types.h> 59 #include <linux/slab.h> 60 #include <linux/in.h> 61 #include <linux/tty.h> 62 #include <linux/proc_fs.h> 63 #include <linux/spinlock.h> 64 #include <linux/jiffies.h> 65 #include <linux/idr.h> 66 67 #if IS_ENABLED(CONFIG_IPV6) 68 #include <net/ipv6.h> 69 #include <net/ip6_route.h> 70 #endif 71 72 #include <linux/uaccess.h> 73 #include <asm/page.h> 74 #include <net/sock.h> 75 #include <net/snmp.h> 76 #include <net/sctp/structs.h> 77 #include <net/sctp/constants.h> 78 79 #ifdef CONFIG_IP_SCTP_MODULE 80 #define SCTP_PROTOSW_FLAG 0 81 #else /* static! */ 82 #define SCTP_PROTOSW_FLAG INET_PROTOSW_PERMANENT 83 #endif 84 85 /* Round an int up to the next multiple of 4. */ 86 #define SCTP_PAD4(s) (((s)+3)&~3) 87 /* Truncate to the previous multiple of 4. */ 88 #define SCTP_TRUNC4(s) ((s)&~3) 89 90 /* 91 * Function declarations. 92 */ 93 94 /* 95 * sctp/protocol.c 96 */ 97 int sctp_copy_local_addr_list(struct net *, struct sctp_bind_addr *, 98 sctp_scope_t, gfp_t gfp, int flags); 99 struct sctp_pf *sctp_get_pf_specific(sa_family_t family); 100 int sctp_register_pf(struct sctp_pf *, sa_family_t); 101 void sctp_addr_wq_mgmt(struct net *, struct sctp_sockaddr_entry *, int); 102 103 /* 104 * sctp/socket.c 105 */ 106 int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb); 107 int sctp_inet_listen(struct socket *sock, int backlog); 108 void sctp_write_space(struct sock *sk); 109 void sctp_data_ready(struct sock *sk); 110 unsigned int sctp_poll(struct file *file, struct socket *sock, 111 poll_table *wait); 112 void sctp_sock_rfree(struct sk_buff *skb); 113 void sctp_copy_sock(struct sock *newsk, struct sock *sk, 114 struct sctp_association *asoc); 115 extern struct percpu_counter sctp_sockets_allocated; 116 int sctp_asconf_mgmt(struct sctp_sock *, struct sctp_sockaddr_entry *); 117 struct sk_buff *sctp_skb_recv_datagram(struct sock *, int, int, int *); 118 119 int sctp_transport_walk_start(struct rhashtable_iter *iter); 120 void sctp_transport_walk_stop(struct rhashtable_iter *iter); 121 struct sctp_transport *sctp_transport_get_next(struct net *net, 122 struct rhashtable_iter *iter); 123 struct sctp_transport *sctp_transport_get_idx(struct net *net, 124 struct rhashtable_iter *iter, int pos); 125 int sctp_transport_lookup_process(int (*cb)(struct sctp_transport *, void *), 126 struct net *net, 127 const union sctp_addr *laddr, 128 const union sctp_addr *paddr, void *p); 129 int sctp_for_each_transport(int (*cb)(struct sctp_transport *, void *), 130 struct net *net, int pos, void *p); 131 int sctp_for_each_endpoint(int (*cb)(struct sctp_endpoint *, void *), void *p); 132 int sctp_get_sctp_info(struct sock *sk, struct sctp_association *asoc, 133 struct sctp_info *info); 134 135 /* 136 * sctp/primitive.c 137 */ 138 int sctp_primitive_ASSOCIATE(struct net *, struct sctp_association *, void *arg); 139 int sctp_primitive_SHUTDOWN(struct net *, struct sctp_association *, void *arg); 140 int sctp_primitive_ABORT(struct net *, struct sctp_association *, void *arg); 141 int sctp_primitive_SEND(struct net *, struct sctp_association *, void *arg); 142 int sctp_primitive_REQUESTHEARTBEAT(struct net *, struct sctp_association *, void *arg); 143 int sctp_primitive_ASCONF(struct net *, struct sctp_association *, void *arg); 144 int sctp_primitive_RECONF(struct net *net, struct sctp_association *asoc, 145 void *arg); 146 147 /* 148 * sctp/input.c 149 */ 150 int sctp_rcv(struct sk_buff *skb); 151 void sctp_v4_err(struct sk_buff *skb, u32 info); 152 void sctp_hash_endpoint(struct sctp_endpoint *); 153 void sctp_unhash_endpoint(struct sctp_endpoint *); 154 struct sock *sctp_err_lookup(struct net *net, int family, struct sk_buff *, 155 struct sctphdr *, struct sctp_association **, 156 struct sctp_transport **); 157 void sctp_err_finish(struct sock *, struct sctp_transport *); 158 void sctp_icmp_frag_needed(struct sock *, struct sctp_association *, 159 struct sctp_transport *t, __u32 pmtu); 160 void sctp_icmp_redirect(struct sock *, struct sctp_transport *, 161 struct sk_buff *); 162 void sctp_icmp_proto_unreachable(struct sock *sk, 163 struct sctp_association *asoc, 164 struct sctp_transport *t); 165 void sctp_backlog_migrate(struct sctp_association *assoc, 166 struct sock *oldsk, struct sock *newsk); 167 int sctp_transport_hashtable_init(void); 168 void sctp_transport_hashtable_destroy(void); 169 int sctp_hash_transport(struct sctp_transport *t); 170 void sctp_unhash_transport(struct sctp_transport *t); 171 struct sctp_transport *sctp_addrs_lookup_transport( 172 struct net *net, 173 const union sctp_addr *laddr, 174 const union sctp_addr *paddr); 175 struct sctp_transport *sctp_epaddr_lookup_transport( 176 const struct sctp_endpoint *ep, 177 const union sctp_addr *paddr); 178 179 /* 180 * sctp/proc.c 181 */ 182 int sctp_snmp_proc_init(struct net *net); 183 void sctp_snmp_proc_exit(struct net *net); 184 int sctp_eps_proc_init(struct net *net); 185 void sctp_eps_proc_exit(struct net *net); 186 int sctp_assocs_proc_init(struct net *net); 187 void sctp_assocs_proc_exit(struct net *net); 188 int sctp_remaddr_proc_init(struct net *net); 189 void sctp_remaddr_proc_exit(struct net *net); 190 191 /* 192 * sctp/offload.c 193 */ 194 int sctp_offload_init(void); 195 196 /* 197 * sctp/stream.c 198 */ 199 int sctp_send_reset_streams(struct sctp_association *asoc, 200 struct sctp_reset_streams *params); 201 int sctp_send_reset_assoc(struct sctp_association *asoc); 202 int sctp_send_add_streams(struct sctp_association *asoc, 203 struct sctp_add_streams *params); 204 205 /* 206 * Module global variables 207 */ 208 209 /* 210 * sctp/protocol.c 211 */ 212 extern struct kmem_cache *sctp_chunk_cachep __read_mostly; 213 extern struct kmem_cache *sctp_bucket_cachep __read_mostly; 214 extern long sysctl_sctp_mem[3]; 215 extern int sysctl_sctp_rmem[3]; 216 extern int sysctl_sctp_wmem[3]; 217 218 /* 219 * Section: Macros, externs, and inlines 220 */ 221 222 /* SCTP SNMP MIB stats handlers */ 223 #define SCTP_INC_STATS(net, field) SNMP_INC_STATS((net)->sctp.sctp_statistics, field) 224 #define __SCTP_INC_STATS(net, field) __SNMP_INC_STATS((net)->sctp.sctp_statistics, field) 225 #define SCTP_DEC_STATS(net, field) SNMP_DEC_STATS((net)->sctp.sctp_statistics, field) 226 227 /* sctp mib definitions */ 228 enum { 229 SCTP_MIB_NUM = 0, 230 SCTP_MIB_CURRESTAB, /* CurrEstab */ 231 SCTP_MIB_ACTIVEESTABS, /* ActiveEstabs */ 232 SCTP_MIB_PASSIVEESTABS, /* PassiveEstabs */ 233 SCTP_MIB_ABORTEDS, /* Aborteds */ 234 SCTP_MIB_SHUTDOWNS, /* Shutdowns */ 235 SCTP_MIB_OUTOFBLUES, /* OutOfBlues */ 236 SCTP_MIB_CHECKSUMERRORS, /* ChecksumErrors */ 237 SCTP_MIB_OUTCTRLCHUNKS, /* OutCtrlChunks */ 238 SCTP_MIB_OUTORDERCHUNKS, /* OutOrderChunks */ 239 SCTP_MIB_OUTUNORDERCHUNKS, /* OutUnorderChunks */ 240 SCTP_MIB_INCTRLCHUNKS, /* InCtrlChunks */ 241 SCTP_MIB_INORDERCHUNKS, /* InOrderChunks */ 242 SCTP_MIB_INUNORDERCHUNKS, /* InUnorderChunks */ 243 SCTP_MIB_FRAGUSRMSGS, /* FragUsrMsgs */ 244 SCTP_MIB_REASMUSRMSGS, /* ReasmUsrMsgs */ 245 SCTP_MIB_OUTSCTPPACKS, /* OutSCTPPacks */ 246 SCTP_MIB_INSCTPPACKS, /* InSCTPPacks */ 247 SCTP_MIB_T1_INIT_EXPIREDS, 248 SCTP_MIB_T1_COOKIE_EXPIREDS, 249 SCTP_MIB_T2_SHUTDOWN_EXPIREDS, 250 SCTP_MIB_T3_RTX_EXPIREDS, 251 SCTP_MIB_T4_RTO_EXPIREDS, 252 SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS, 253 SCTP_MIB_DELAY_SACK_EXPIREDS, 254 SCTP_MIB_AUTOCLOSE_EXPIREDS, 255 SCTP_MIB_T1_RETRANSMITS, 256 SCTP_MIB_T3_RETRANSMITS, 257 SCTP_MIB_PMTUD_RETRANSMITS, 258 SCTP_MIB_FAST_RETRANSMITS, 259 SCTP_MIB_IN_PKT_SOFTIRQ, 260 SCTP_MIB_IN_PKT_BACKLOG, 261 SCTP_MIB_IN_PKT_DISCARDS, 262 SCTP_MIB_IN_DATA_CHUNK_DISCARDS, 263 __SCTP_MIB_MAX 264 }; 265 266 #define SCTP_MIB_MAX __SCTP_MIB_MAX 267 struct sctp_mib { 268 unsigned long mibs[SCTP_MIB_MAX]; 269 }; 270 271 /* helper function to track stats about max rto and related transport */ 272 static inline void sctp_max_rto(struct sctp_association *asoc, 273 struct sctp_transport *trans) 274 { 275 if (asoc->stats.max_obs_rto < (__u64)trans->rto) { 276 asoc->stats.max_obs_rto = trans->rto; 277 memset(&asoc->stats.obs_rto_ipaddr, 0, 278 sizeof(struct sockaddr_storage)); 279 memcpy(&asoc->stats.obs_rto_ipaddr, &trans->ipaddr, 280 trans->af_specific->sockaddr_len); 281 } 282 } 283 284 /* 285 * Macros for keeping a global reference of object allocations. 286 */ 287 #ifdef CONFIG_SCTP_DBG_OBJCNT 288 289 extern atomic_t sctp_dbg_objcnt_sock; 290 extern atomic_t sctp_dbg_objcnt_ep; 291 extern atomic_t sctp_dbg_objcnt_assoc; 292 extern atomic_t sctp_dbg_objcnt_transport; 293 extern atomic_t sctp_dbg_objcnt_chunk; 294 extern atomic_t sctp_dbg_objcnt_bind_addr; 295 extern atomic_t sctp_dbg_objcnt_bind_bucket; 296 extern atomic_t sctp_dbg_objcnt_addr; 297 extern atomic_t sctp_dbg_objcnt_datamsg; 298 extern atomic_t sctp_dbg_objcnt_keys; 299 300 /* Macros to atomically increment/decrement objcnt counters. */ 301 #define SCTP_DBG_OBJCNT_INC(name) \ 302 atomic_inc(&sctp_dbg_objcnt_## name) 303 #define SCTP_DBG_OBJCNT_DEC(name) \ 304 atomic_dec(&sctp_dbg_objcnt_## name) 305 #define SCTP_DBG_OBJCNT(name) \ 306 atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0) 307 308 /* Macro to help create new entries in in the global array of 309 * objcnt counters. 310 */ 311 #define SCTP_DBG_OBJCNT_ENTRY(name) \ 312 {.label= #name, .counter= &sctp_dbg_objcnt_## name} 313 314 void sctp_dbg_objcnt_init(struct net *); 315 void sctp_dbg_objcnt_exit(struct net *); 316 317 #else 318 319 #define SCTP_DBG_OBJCNT_INC(name) 320 #define SCTP_DBG_OBJCNT_DEC(name) 321 322 static inline void sctp_dbg_objcnt_init(struct net *net) { return; } 323 static inline void sctp_dbg_objcnt_exit(struct net *net) { return; } 324 325 #endif /* CONFIG_SCTP_DBG_OBJCOUNT */ 326 327 #if defined CONFIG_SYSCTL 328 void sctp_sysctl_register(void); 329 void sctp_sysctl_unregister(void); 330 int sctp_sysctl_net_register(struct net *net); 331 void sctp_sysctl_net_unregister(struct net *net); 332 #else 333 static inline void sctp_sysctl_register(void) { return; } 334 static inline void sctp_sysctl_unregister(void) { return; } 335 static inline int sctp_sysctl_net_register(struct net *net) { return 0; } 336 static inline void sctp_sysctl_net_unregister(struct net *net) { return; } 337 #endif 338 339 /* Size of Supported Address Parameter for 'x' address types. */ 340 #define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16)) 341 342 #if IS_ENABLED(CONFIG_IPV6) 343 344 void sctp_v6_pf_init(void); 345 void sctp_v6_pf_exit(void); 346 int sctp_v6_protosw_init(void); 347 void sctp_v6_protosw_exit(void); 348 int sctp_v6_add_protocol(void); 349 void sctp_v6_del_protocol(void); 350 351 #else /* #ifdef defined(CONFIG_IPV6) */ 352 353 static inline void sctp_v6_pf_init(void) { return; } 354 static inline void sctp_v6_pf_exit(void) { return; } 355 static inline int sctp_v6_protosw_init(void) { return 0; } 356 static inline void sctp_v6_protosw_exit(void) { return; } 357 static inline int sctp_v6_add_protocol(void) { return 0; } 358 static inline void sctp_v6_del_protocol(void) { return; } 359 360 #endif /* #if defined(CONFIG_IPV6) */ 361 362 363 /* Map an association to an assoc_id. */ 364 static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc) 365 { 366 return asoc ? asoc->assoc_id : 0; 367 } 368 369 static inline enum sctp_sstat_state 370 sctp_assoc_to_state(const struct sctp_association *asoc) 371 { 372 /* SCTP's uapi always had SCTP_EMPTY(=0) as a dummy state, but we 373 * got rid of it in kernel space. Therefore SCTP_CLOSED et al 374 * start at =1 in user space, but actually as =0 in kernel space. 375 * Now that we can not break user space and SCTP_EMPTY is exposed 376 * there, we need to fix it up with an ugly offset not to break 377 * applications. :( 378 */ 379 return asoc->state + 1; 380 } 381 382 /* Look up the association by its id. */ 383 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id); 384 385 int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp); 386 387 /* A macro to walk a list of skbs. */ 388 #define sctp_skb_for_each(pos, head, tmp) \ 389 skb_queue_walk_safe(head, pos, tmp) 390 391 /** 392 * sctp_list_dequeue - remove from the head of the queue 393 * @list: list to dequeue from 394 * 395 * Remove the head of the list. The head item is 396 * returned or %NULL if the list is empty. 397 */ 398 399 static inline struct list_head *sctp_list_dequeue(struct list_head *list) 400 { 401 struct list_head *result = NULL; 402 403 if (!list_empty(list)) { 404 result = list->next; 405 list_del_init(result); 406 } 407 return result; 408 } 409 410 /* SCTP version of skb_set_owner_r. We need this one because 411 * of the way we have to do receive buffer accounting on bundled 412 * chunks. 413 */ 414 static inline void sctp_skb_set_owner_r(struct sk_buff *skb, struct sock *sk) 415 { 416 struct sctp_ulpevent *event = sctp_skb2event(skb); 417 418 skb_orphan(skb); 419 skb->sk = sk; 420 skb->destructor = sctp_sock_rfree; 421 atomic_add(event->rmem_len, &sk->sk_rmem_alloc); 422 /* 423 * This mimics the behavior of skb_set_owner_r 424 */ 425 sk->sk_forward_alloc -= event->rmem_len; 426 } 427 428 /* Tests if the list has one and only one entry. */ 429 static inline int sctp_list_single_entry(struct list_head *head) 430 { 431 return (head->next != head) && (head->next == head->prev); 432 } 433 434 /* Break down data chunks at this point. */ 435 static inline int sctp_frag_point(const struct sctp_association *asoc, int pmtu) 436 { 437 struct sctp_sock *sp = sctp_sk(asoc->base.sk); 438 int frag = pmtu; 439 440 frag -= sp->pf->af->net_header_len; 441 frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk); 442 443 if (asoc->user_frag) 444 frag = min_t(int, frag, asoc->user_frag); 445 446 frag = SCTP_TRUNC4(min_t(int, frag, SCTP_MAX_CHUNK_LEN)); 447 448 return frag; 449 } 450 451 static inline void sctp_assoc_pending_pmtu(struct sctp_association *asoc) 452 { 453 sctp_assoc_sync_pmtu(asoc); 454 asoc->pmtu_pending = 0; 455 } 456 457 static inline bool sctp_chunk_pending(const struct sctp_chunk *chunk) 458 { 459 return !list_empty(&chunk->list); 460 } 461 462 /* Walk through a list of TLV parameters. Don't trust the 463 * individual parameter lengths and instead depend on 464 * the chunk length to indicate when to stop. Make sure 465 * there is room for a param header too. 466 */ 467 #define sctp_walk_params(pos, chunk, member)\ 468 _sctp_walk_params((pos), (chunk), ntohs((chunk)->chunk_hdr.length), member) 469 470 #define _sctp_walk_params(pos, chunk, end, member)\ 471 for (pos.v = chunk->member;\ 472 pos.v <= (void *)chunk + end - ntohs(pos.p->length) &&\ 473 ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\ 474 pos.v += SCTP_PAD4(ntohs(pos.p->length))) 475 476 #define sctp_walk_errors(err, chunk_hdr)\ 477 _sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length)) 478 479 #define _sctp_walk_errors(err, chunk_hdr, end)\ 480 for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \ 481 sizeof(sctp_chunkhdr_t));\ 482 (void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\ 483 ntohs(err->length) >= sizeof(sctp_errhdr_t); \ 484 err = (sctp_errhdr_t *)((void *)err + SCTP_PAD4(ntohs(err->length)))) 485 486 #define sctp_walk_fwdtsn(pos, chunk)\ 487 _sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk)) 488 489 #define _sctp_walk_fwdtsn(pos, chunk, end)\ 490 for (pos = chunk->subh.fwdtsn_hdr->skip;\ 491 (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\ 492 pos++) 493 494 /* External references. */ 495 496 extern struct proto sctp_prot; 497 extern struct proto sctpv6_prot; 498 void sctp_put_port(struct sock *sk); 499 500 extern struct idr sctp_assocs_id; 501 extern spinlock_t sctp_assocs_id_lock; 502 503 /* Static inline functions. */ 504 505 /* Convert from an IP version number to an Address Family symbol. */ 506 static inline int ipver2af(__u8 ipver) 507 { 508 switch (ipver) { 509 case 4: 510 return AF_INET; 511 case 6: 512 return AF_INET6; 513 default: 514 return 0; 515 } 516 } 517 518 /* Convert from an address parameter type to an address family. */ 519 static inline int param_type2af(__be16 type) 520 { 521 switch (type) { 522 case SCTP_PARAM_IPV4_ADDRESS: 523 return AF_INET; 524 case SCTP_PARAM_IPV6_ADDRESS: 525 return AF_INET6; 526 default: 527 return 0; 528 } 529 } 530 531 /* Warning: The following hash functions assume a power of two 'size'. */ 532 /* This is the hash function for the SCTP port hash table. */ 533 static inline int sctp_phashfn(struct net *net, __u16 lport) 534 { 535 return (net_hash_mix(net) + lport) & (sctp_port_hashsize - 1); 536 } 537 538 /* This is the hash function for the endpoint hash table. */ 539 static inline int sctp_ep_hashfn(struct net *net, __u16 lport) 540 { 541 return (net_hash_mix(net) + lport) & (sctp_ep_hashsize - 1); 542 } 543 544 #define sctp_for_each_hentry(epb, head) \ 545 hlist_for_each_entry(epb, head, node) 546 547 /* Is a socket of this style? */ 548 #define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style)) 549 static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style) 550 { 551 return sctp_sk(sk)->type == style; 552 } 553 554 /* Is the association in this state? */ 555 #define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state)) 556 static inline int __sctp_state(const struct sctp_association *asoc, 557 sctp_state_t state) 558 { 559 return asoc->state == state; 560 } 561 562 /* Is the socket in this state? */ 563 #define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state)) 564 static inline int __sctp_sstate(const struct sock *sk, sctp_sock_state_t state) 565 { 566 return sk->sk_state == state; 567 } 568 569 /* Map v4-mapped v6 address back to v4 address */ 570 static inline void sctp_v6_map_v4(union sctp_addr *addr) 571 { 572 addr->v4.sin_family = AF_INET; 573 addr->v4.sin_port = addr->v6.sin6_port; 574 addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3]; 575 } 576 577 /* Map v4 address to v4-mapped v6 address */ 578 static inline void sctp_v4_map_v6(union sctp_addr *addr) 579 { 580 __be16 port; 581 582 port = addr->v4.sin_port; 583 addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr; 584 addr->v6.sin6_port = port; 585 addr->v6.sin6_family = AF_INET6; 586 addr->v6.sin6_flowinfo = 0; 587 addr->v6.sin6_scope_id = 0; 588 addr->v6.sin6_addr.s6_addr32[0] = 0; 589 addr->v6.sin6_addr.s6_addr32[1] = 0; 590 addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff); 591 } 592 593 /* The cookie is always 0 since this is how it's used in the 594 * pmtu code. 595 */ 596 static inline struct dst_entry *sctp_transport_dst_check(struct sctp_transport *t) 597 { 598 if (t->dst && !dst_check(t->dst, t->dst_cookie)) 599 sctp_transport_dst_release(t); 600 601 return t->dst; 602 } 603 604 static inline bool sctp_transport_pmtu_check(struct sctp_transport *t) 605 { 606 __u32 pmtu = max_t(size_t, SCTP_TRUNC4(dst_mtu(t->dst)), 607 SCTP_DEFAULT_MINSEGMENT); 608 609 if (t->pathmtu == pmtu) 610 return true; 611 612 t->pathmtu = pmtu; 613 614 return false; 615 } 616 617 #endif /* __net_sctp_h__ */ 618